Abstract: A method of setting up wireless communication between a client device and a wireless connection device, the method including: establishing non-limited, temporary communication between devices; obtaining an identifier assigned to a client device or an identifier assigned to connection between the client device and a wireless connection device; limiting a device accessing the temporary communication by using the obtained identifier; causing the client device to receive a file for communication settings for the wireless connection device; establishing encrypted communication in conformity with a predetermined protocol; and causing information on communication settings to be exchanged via the encrypted communication.

Abstract: A method of authenticating a client device, the method including: (a) sending information to a client device indicating an image group to be displayed by the client device, wherein the image group includes a plurality of images each assigned to a respective one of a plurality of characters; (b) obtaining, from the client device, a plurality of images selected from the image group displayed by the client device and a specified order of the plurality of selected images; (c) creating a set of characters based on the plurality of selected images, the specified order of the plurality of selected images, and the characters assigned to each of the plurality of selected images; and (d) authenticating the client device based on a determination of whether the created set of characters matches information of a permission candidate stored in advance by the wireless connection device.